linux-stable/drivers/gpu/drm/drm_auth.c

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/*
* Created: Tue Feb 2 08:37:54 1999 by faith@valinux.com
*
* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
* All Rights Reserved.
*
* Author Rickard E. (Rik) Faith <faith@valinux.com>
* Author Gareth Hughes <gareth@valinux.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include <drm/drmP.h>
#include "drm_internal.h"
#include "drm_legacy.h"
/**
* drm_getmagic - Get unique magic of a client
* @dev: DRM device to operate on
* @data: ioctl data containing the drm_auth object
* @file_priv: DRM file that performs the operation
*
* This looks up the unique magic of the passed client and returns it. If the
* client did not have a magic assigned, yet, a new one is registered. The magic
* is stored in the passed drm_auth object.
*
* Returns: 0 on success, negative error code on failure.
*/
int drm_getmagic(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
struct drm_auth *auth = data;
int ret = 0;
mutex_lock(&dev->master_mutex);
if (!file_priv->magic) {
ret = idr_alloc(&file_priv->master->magic_map, file_priv,
1, 0, GFP_KERNEL);
if (ret >= 0)
file_priv->magic = ret;
}
auth->magic = file_priv->magic;
mutex_unlock(&dev->master_mutex);
DRM_DEBUG("%u\n", auth->magic);
return ret < 0 ? ret : 0;
}
/**
* drm_authmagic - Authenticate client with a magic
* @dev: DRM device to operate on
* @data: ioctl data containing the drm_auth object
* @file_priv: DRM file that performs the operation
*
* This looks up a DRM client by the passed magic and authenticates it.
*
* Returns: 0 on success, negative error code on failure.
*/
int drm_authmagic(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_auth *auth = data;
struct drm_file *file;
DRM_DEBUG("%u\n", auth->magic);
mutex_lock(&dev->master_mutex);
file = idr_find(&file_priv->master->magic_map, auth->magic);
if (file) {
file->authenticated = 1;
idr_replace(&file_priv->master->magic_map, NULL, auth->magic);
}
mutex_unlock(&dev->master_mutex);
return file ? 0 : -EINVAL;
}
static struct drm_master *drm_master_create(struct drm_device *dev)
{
struct drm_master *master;
master = kzalloc(sizeof(*master), GFP_KERNEL);
if (!master)
return NULL;
kref_init(&master->refcount);
spin_lock_init(&master->lock.spinlock);
init_waitqueue_head(&master->lock.lock_queue);
idr_init(&master->magic_map);
master->dev = dev;
return master;
}
static int drm_set_master(struct drm_device *dev, struct drm_file *fpriv,
bool new_master)
{
int ret = 0;
dev->master = drm_master_get(fpriv->master);
fpriv->is_master = 1;
if (dev->driver->master_set) {
ret = dev->driver->master_set(dev, fpriv, new_master);
if (unlikely(ret != 0)) {
fpriv->is_master = 0;
drm_master_put(&dev->master);
}
}
return ret;
}
/*
* drm_new_set_master - Allocate a new master object and become master for the
* associated master realm.
*
* @dev: The associated device.
* @fpriv: File private identifying the client.
*
* This function must be called with dev::master_mutex held.
* Returns negative error code on failure. Zero on success.
*/
static int drm_new_set_master(struct drm_device *dev, struct drm_file *fpriv)
{
struct drm_master *old_master;
int ret;
lockdep_assert_held_once(&dev->master_mutex);
old_master = fpriv->master;
fpriv->master = drm_master_create(dev);
if (!fpriv->master) {
fpriv->master = old_master;
return -ENOMEM;
}
if (dev->driver->master_create) {
ret = dev->driver->master_create(dev, fpriv->master);
if (ret)
goto out_err;
}
fpriv->allowed_master = 1;
fpriv->authenticated = 1;
ret = drm_set_master(dev, fpriv, true);
if (ret)
goto out_err;
if (old_master)
drm_master_put(&old_master);
return 0;
out_err:
/* drop references and restore old master on failure */
drm_master_put(&fpriv->master);
fpriv->master = old_master;
return ret;
}
int drm_setmaster_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
int ret = 0;
mutex_lock(&dev->master_mutex);
if (drm_is_current_master(file_priv))
goto out_unlock;
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if (dev->master) {
ret = -EINVAL;
goto out_unlock;
}
if (!file_priv->master) {
ret = -EINVAL;
goto out_unlock;
}
if (!file_priv->allowed_master) {
ret = drm_new_set_master(dev, file_priv);
goto out_unlock;
}
ret = drm_set_master(dev, file_priv, false);
out_unlock:
mutex_unlock(&dev->master_mutex);
return ret;
}
static void drm_drop_master(struct drm_device *dev,
struct drm_file *fpriv)
{
if (dev->driver->master_drop)
dev->driver->master_drop(dev, fpriv);
drm_master_put(&dev->master);
fpriv->is_master = 0;
}
int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
int ret = -EINVAL;
mutex_lock(&dev->master_mutex);
if (!drm_is_current_master(file_priv))
goto out_unlock;
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if (!dev->master)
goto out_unlock;
ret = 0;
drm_drop_master(dev, file_priv);
out_unlock:
mutex_unlock(&dev->master_mutex);
return ret;
}
int drm_master_open(struct drm_file *file_priv)
{
struct drm_device *dev = file_priv->minor->dev;
int ret = 0;
/* if there is no current master make this fd it, but do not create
* any master object for render clients */
mutex_lock(&dev->master_mutex);
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if (!dev->master)
ret = drm_new_set_master(dev, file_priv);
else
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file_priv->master = drm_master_get(dev->master);
mutex_unlock(&dev->master_mutex);
return ret;
}
void drm_master_release(struct drm_file *file_priv)
{
struct drm_device *dev = file_priv->minor->dev;
struct drm_master *master = file_priv->master;
mutex_lock(&dev->master_mutex);
if (file_priv->magic)
idr_remove(&file_priv->master->magic_map, file_priv->magic);
if (!drm_is_current_master(file_priv))
goto out;
if (!drm_core_check_feature(dev, DRIVER_MODESET)) {
/*
* Since the master is disappearing, so is the
* possibility to lock.
*/
mutex_lock(&dev->struct_mutex);
if (master->lock.hw_lock) {
if (dev->sigdata.lock == master->lock.hw_lock)
dev->sigdata.lock = NULL;
master->lock.hw_lock = NULL;
master->lock.file_priv = NULL;
wake_up_interruptible_all(&master->lock.lock_queue);
}
mutex_unlock(&dev->struct_mutex);
}
if (dev->master == file_priv->master)
drm_drop_master(dev, file_priv);
out:
/* drop the master reference held by the file priv */
if (file_priv->master)
drm_master_put(&file_priv->master);
mutex_unlock(&dev->master_mutex);
}
bool drm_is_current_master(struct drm_file *fpriv)
{
return fpriv->is_master;
}
EXPORT_SYMBOL(drm_is_current_master);
struct drm_master *drm_master_get(struct drm_master *master)
{
kref_get(&master->refcount);
return master;
}
EXPORT_SYMBOL(drm_master_get);
static void drm_master_destroy(struct kref *kref)
{
struct drm_master *master = container_of(kref, struct drm_master, refcount);
struct drm_device *dev = master->dev;
if (dev->driver->master_destroy)
dev->driver->master_destroy(dev, master);
drm_legacy_master_rmmaps(dev, master);
idr_destroy(&master->magic_map);
kfree(master->unique);
kfree(master);
}
void drm_master_put(struct drm_master **master)
{
kref_put(&(*master)->refcount, drm_master_destroy);
*master = NULL;
}
EXPORT_SYMBOL(drm_master_put);